I use a york compressor in My CJ. It was fairly easy. I used the Stock mounting bracket that I found on an old AMC car with a 258 and got a rebuilt york out of a Volvo. All of this I found at the junkyard for under 80 bucks. I had a tank already and the the rest was just air chucks and hose. It all cost me about 300 bucks. It works very well. Do a search in google and it will pop up a bunch of write ups.

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1982/1992 CYJ "FrankenJeep" SOA with Waggy Springs 1" body, 4.0 head, borla headers & cat back, mopar MPI, Jacobs ignition, York air, Custom 3" intake w/k&n, K5 heater, Flexlight fan, 33" Coopers, DANA 44's, lockright up front, NP 435...In progress.